The Fitbit Flex 2 Wireless Activity Wristband Black provides the tools you need to stay in shape. Including a waterproof screen and a 3-axis accelerometer, it gives you credit for all your hard work, in any environment. Perfect for people hoping to stay on track, it features a running mode, accommodating many types of sports. Designed with a distance tracker and an active minute calculator, this Fitbit device will be perfect for motivating you when you take on tough challenges. The battery lasts for five days, so you won't have to worry about charging every night. The movement alert of this Fitbit tracker is perfect for busy people who need a reminder to stay on their feet. Check your alerts outside with this fitness device's phone notifications on its water resistant LED screen. This device is equipped with the Fitbit App and syncs wirelessly, so you can easily back up your data across multiple devices.